Anisotropic superconductivity and unusually robust electronic critical field in single crystal La7Ir3
D. A. Mayoh, S. J. R. Holt, T. Takabatake, G. Balakrishnan, M. R. Lees
DOI 10.1103/PhysRevMaterials.5.114803 · Physical Review Materials
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Abstract
Polycrystalline La7Ir3 is reported to show superconductivity breaking time-reversal symmetry while also having an isotropic s-wave gap. Single crystals of this noncentrosymmetric superconductor are highly desirable to understand the nature of the electron pairing mechanism in this system. Here we report the growth of high-quality single crystals of La7Ir3 by the Czochralski method. The structural and superconducting properties of these large crystals have been investigated using x-rays, magnetization, resistivity, and heat capacity measurements. We observe a clear anisotropy in the lower and upper critical fields for magnetic fields applied parallel and perpendicular to the hexagonal c axis. We also report the presence of a robust electronic critical field, that diverges from the upper critical field derived from heat capacity, which is the hallmark of surface superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La7Ir3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.41 | Pressure not reported | onset |
| La7Ir3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.25 | Pressure not reported | unknown |
| La7Ir3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.47 | Pressure not reported | onset |
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